#! /usr/bin/env python

import sys

import os.path

import pybindgen.settings

from pybindgen.gccxmlparser import ModuleParser, PygenClassifier, PygenSection, WrapperWarning

from pybindgen.typehandlers.codesink import FileCodeSink

from pygccxml.declarations import templates

from pygccxml.declarations.class_declaration import class_t

from pygccxml.declarations.calldef import free_function_t, member_function_t, constructor_t

## we need the smart pointer type transformation to be active even

## during gccxml scanning.

import ns3modulegen_core_customizations

## silence gccxmlparser errors; we only want error handling in the

## generated python script, not while scanning.

class ErrorHandler(pybindgen.settings.ErrorHandler):

    def handle_error(self, dummy_wrapper, dummy_exception, dummy_traceback_):

        return True

pybindgen.settings.error_handler = ErrorHandler()

import warnings

warnings.filterwarnings(category=WrapperWarning, action='ignore')

type_annotations = {

    '::ns3::RefCountBase': {

        'incref_method': 'Ref',

        'decref_method': 'Unref',

        'peekref_method': 'GetReferenceCount',

        'automatic_type_narrowing': 'true',

        },

    '::ns3::Object': {

        'incref_method': 'Ref',

        'decref_method': 'Unref',

        'peekref_method': 'GetReferenceCount',

        'automatic_type_narrowing': 'true',

        },

    '::ns3::Packet': {

        'incref_method': 'Ref',

        'decref_method': 'Unref',

        'peekref_method': 'GetReferenceCount',

        },

    '::ns3::CallbackImplBase': {

        'incref_method': 'Ref',

        'decref_method': 'Unref',

        'peekref_method': 'GetReferenceCount',

        },

    '::ns3::AttributeChecker': {

        'automatic_type_narrowing': 'true',

        'allow_subclassing': 'false',

        },

    '::ns3::AttributeValue': {

        'automatic_type_narrowing': 'true',

        'allow_subclassing': 'false',

        },

    '::ns3::CommandLine': {

        'allow_subclassing': 'true', # needed so that AddValue is able to set attributes on the object

        },

    '::ns3::NscTcpL4Protocol': {

        'ignore': 'true', # this class is implementation detail

        },

    'ns3::RandomVariable::RandomVariable(ns3::RandomVariableBase const & variable) [constructor]': {

        'ignore': None,

        },

    'ns3::RandomVariableBase * ns3::RandomVariable::Peek() const [member function]': {

        'ignore': None,

        },

    'void ns3::RandomVariable::GetSeed(uint32_t * seed) const [member function]': {

        'params': {'seed':{'direction':'out',

                           'array_length':'6'}}

        },

    'bool ns3::TypeId::LookupAttributeByName(std::string name, ns3::TypeId::AttributeInfo * info) const [member function]': {

        'params': {'info':{'transfer_ownership': 'false'}}

        },

    'static bool ns3::TypeId::LookupByNameFailSafe(std::string name, ns3::TypeId * tid) [member function]': {

        'ignore': None, # manually wrapped in 

        },

    'bool ns3::TraceSourceAccessor::ConnectWithoutContext(ns3::ObjectBase * obj, ns3::CallbackBase const & cb) const [member function]': {

        'params': {'obj': {'transfer_ownership':'false'}}

        },

    'bool ns3::TraceSourceAccessor::Connect(ns3::ObjectBase * obj, std::string context, ns3::CallbackBase const & cb) const [member function]': {

        'params': {'obj': {'transfer_ownership':'false'}}

        },

    'bool ns3::TraceSourceAccessor::DisconnectWithoutContext(ns3::ObjectBase * obj, ns3::CallbackBase const & cb) const [member function]': {

        'params': {'obj': {'transfer_ownership':'false'}}

        },

    'bool ns3::TraceSourceAccessor::Disconnect(ns3::ObjectBase * obj, std::string context, ns3::CallbackBase const & cb) const [member function]': {

        'params': {'obj': {'transfer_ownership':'false'}}

        },

    'bool ns3::AttributeAccessor::Set(ns3::ObjectBase * object, ns3::AttributeValue const & value) const [member function]': {

        'params': {'object': {'transfer_ownership':'false'}}

        },

    'ns3::EmpiricalVariable::EmpiricalVariable(ns3::RandomVariableBase const & variable) [constructor]': {

        'ignore': None

        },

    'static ns3::AttributeList * ns3::AttributeList::GetGlobal() [member function]': {

        'caller_owns_return': 'false'

        },

    'void ns3::CommandLine::Parse(int argc, char * * argv) const [member function]': {

        'ignore': None # manually wrapped

        },

    'extern void ns3::PythonCompleteConstruct(ns3::Ptr<ns3::Object> object, ns3::TypeId typeId, ns3::AttributeList const & attributes) [free function]': {

        'ignore': None # used transparently by, should not be wrapped

        },

    }

def get_ns3_relative_path(path):

    l = []

    head = path

    while head:

        head, tail = os.path.split(head)

        if tail == 'ns3':

            return os.path.join(*l)

        l.insert(0, tail)

    raise AssertionError("is the path %r inside ns3?!" % path)

def pre_scan_hook(dummy_module_parser,

                  pygccxml_definition,

                  global_annotations,

                  parameter_annotations):

    ns3_header = get_ns3_relative_path(pygccxml_definition.location.file_name)

    ## Note: we don't include line numbers in the comments because

    ## those numbers are very likely to change frequently, which would

    ## cause needless changes, since the generated python files are

    ## kept under version control.

    #global_annotations['pygen_comment'] = "%s:%i: %s" % \

    #    (ns3_header, pygccxml_definition.location.line, pygccxml_definition)

    global_annotations['pygen_comment'] = "%s: %s" % \

        (ns3_header, pygccxml_definition)

    ## handle ns3::Object::GetObject (left to its own devices,

    ## pybindgen will generate a mangled name containing the template

    ## argument type name).

    if isinstance(pygccxml_definition, member_function_t) \

            and pygccxml_definition.parent.name == 'Object' \

            and pygccxml_definition.name == 'GetObject':

        template_args = templates.args(pygccxml_definition.demangled_name)

        if template_args == ['ns3::Object']:

            global_annotations['template_instance_names'] = 'ns3::Object=>GetObject'

    ## Don't wrap Simulator::Schedule* (manually wrapped)

    if isinstance(pygccxml_definition, member_function_t) \

            and pygccxml_definition.parent.name == 'Simulator' \

            and pygccxml_definition.name.startswith('Schedule'):

        global_annotations['ignore'] = None

    # manually wrapped

    if isinstance(pygccxml_definition, member_function_t) \

            and pygccxml_definition.parent.name == 'Simulator' \

            and pygccxml_definition.name == 'Run':

        global_annotations['ignore'] = True

    ## classes

    if isinstance(pygccxml_definition, class_t):

        # no need for helper classes to allow subclassing in Python, I think...

        if pygccxml_definition.name.endswith('Helper'):

            global_annotations['allow_subclassing'] = 'false'

        if pygccxml_definition.decl_string.startswith('::ns3::Callback<'):

            # manually handled in ns3modulegen_core_customizations.py

            global_annotations['ignore'] = None

            return

        if pygccxml_definition.decl_string.startswith('::ns3::TracedCallback<'):

            global_annotations['ignore'] = None

            return

        if pygccxml_definition.decl_string.startswith('::ns3::Ptr<'):

            # handled by pybindgen "type transformation"

            global_annotations['ignore'] = None

            return

        # table driven class customization

        try:

            annotations = type_annotations[pygccxml_definition.decl_string]

        except KeyError:

            pass

        else:

            global_annotations.update(annotations)

    ## free functions

    if isinstance(pygccxml_definition, free_function_t):

        if pygccxml_definition.name == 'PeekPointer':

            global_annotations['ignore'] = None

            return

    ## table driven methods/constructors/functions customization

    if isinstance(pygccxml_definition, (free_function_t, member_function_t, constructor_t)):

        try:

            annotations = type_annotations[str(pygccxml_definition)]

        except KeyError:

            pass

        else:

            for key,value in annotations.items():

                if key == 'params':

                    parameter_annotations.update (value)

                    del annotations['params']

            global_annotations.update(annotations)

# def post_scan_hook(dummy_module_parser, dummy_pygccxml_definition, pybindgen_wrapper):

#     ## classes

#     if isinstance(pybindgen_wrapper, CppClass):

#         if pybindgen_wrapper.name.endswith('Checker'):

#             print >> sys.stderr, "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!", pybindgen_wrapper

#             #pybindgen_wrapper.set_instance_creation_function(AttributeChecker_instance_creation_function)

def scan_callback_classes(module_parser, callback_classes_file):

    callback_classes_file.write("callback_classes = [\n")

    for cls in module_parser.module_namespace.classes(function=module_parser.location_filter,

                                                      recursive=False):

        if not cls.name.startswith("Callback<"):

            continue

        assert templates.is_instantiation(cls.decl_string), "%s is not a template instantiation" % cls

        dummy_cls_name, template_parameters = templates.split(cls.decl_string)

        callback_classes_file.write("    %r,\n" % template_parameters)

    callback_classes_file.write("]\n")

class MyPygenClassifier(PygenClassifier):

    def __init__(self, headers_map):

        self.headers_map = headers_map

    def classify(self, pygccxml_definition):

        name = os.path.basename(pygccxml_definition.location.file_name)

        try:

            return self.headers_map[name]

        except KeyError:

            return '__main__'

def ns3_module_scan(top_builddir, pygen_file_name, everything_h, cflags):

    ns3_modules = eval(sys.stdin.read())

    ## do a topological sort on the modules graph

    from topsort import topsort

    graph = []

    for ns3_module_name, (ns3_module_deps, dummy) in ns3_modules.iteritems():

        for dep in ns3_module_deps:

            graph.append((dep, ns3_module_name))

    sorted_ns3_modules = topsort(graph)

    #print >> sys.stderr, "******* topological sort: ", sorted_ns3_modules

    sections = [PygenSection('__main__', FileCodeSink(open(pygen_file_name, "wt")))]

    headers_map = {} # header_name -> section_name

    for ns3_module in sorted_ns3_modules:

        section_name = "ns3_module_%s" % ns3_module.replace('-', '_')

        file_name = os.path.join(os.path.dirname(pygen_file_name), "%s.py" % section_name)

        sections.append(PygenSection(section_name, FileCodeSink(open(file_name, "wt")),

                                     section_name + "__local"))

        for header in ns3_modules[ns3_module][1]:

            headers_map[header] = section_name

    module_parser = ModuleParser('ns3', 'ns3')

    module_parser.add_pre_scan_hook(pre_scan_hook)

    #module_parser.add_post_scan_hook(post_scan_hook)

    gccxml_options = dict(

        include_paths=[top_builddir],

         define_symbols={

            #'NS3_ASSERT_ENABLE': None,

            #'NS3_LOG_ENABLE': None,

            },

        cflags=('--gccxml-cxxflags %r' % (cflags,))

        )

    module_parser.parse_init([everything_h],

                             None, whitelist_paths=[top_builddir, os.path.dirname(everything_h)],

                             #includes=['"ns3/everything.h"'],

                             pygen_sink=sections,

                             pygen_classifier=MyPygenClassifier(headers_map),

                             gccxml_options=gccxml_options)

    module_parser.scan_types()

    callback_classes_file = open(os.path.join(os.path.dirname(pygen_file_name), "callbacks_list.py"), "wt")

    scan_callback_classes(module_parser, callback_classes_file)

    callback_classes_file.close()

    module_parser.scan_methods()

    module_parser.scan_functions()

    module_parser.parse_finalize()

    for section in sections:

        section.code_sink.file.close()

if __name__ == '__main__':

    ns3_module_scan(sys.argv[1], sys.argv[3], sys.argv[2], sys.argv[4])